content: Cleanup class/struct forward declarations

content/browser/cache_storage/cache_storage_quota_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_QUOTA_CLIENT_H_
 #define CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_QUOTA_CLIENT_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "storage/browser/quota/quota_client.h"
 #include "storage/common/quota/quota_types.h"
 
-namespace storage {
-class QuotaManagerProxy;
-}
-
 namespace content {
 class CacheStorageManager;
 
 // CacheStorageQuotaClient is owned by the QuotaManager. There is one per
 // CacheStorageManager, and therefore one per
 // ServiceWorkerContextCore.
 class CONTENT_EXPORT CacheStorageQuotaClient : public storage::QuotaClient {
  public:
   explicit CacheStorageQuotaClient(
       base::WeakPtr<CacheStorageManager> cache_manager);
@@ skipping 17 matching lines @@
 
  private:
   base::WeakPtr<CacheStorageManager> cache_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(CacheStorageQuotaClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_QUOTA_CLIENT_H_